Use cf auth for cfpush script too
Use cf auth for cfpush script too

* cf login will prompt for password on unsuccessful login (even if it's a
connection issue), which we want to avoid.
* cf auth uses the already exported CF_USERNAME and CF_PASSWORD env vars

[#174837918]

Co-authored-by: Georgi Sabev <cd7643e50243a10153b49cb72b4bdbf8b48cb045@gmail.com>

cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release